Carlisle's Sure-Flex PVC Membrane Cleaner is used to clean in-service PVC and KEE HP membranes that have been exposed to the weather prior to the welding process. This cleaner helps to loosen and remove dirt and other contaminants from the surface of the membranes, improves adhesion and leaves a suitable surface for welding. While not as effective on TPO membrane as TPO Weathered Membrane Cleaner, PVC Membrane Cleaner can be used for cleaning TPO membrane.